The biggest shopping day of the year is expected be the launch pad for tablets to overtake notebook shipments in North America for the first time, according to research firm NPD DisplaySearch.

NEW YORK ( TheStreet) - The rise of the tablet continues. This year's Black Friday is expected to be the launch pad for tablets, such as Apple's ( AAPL) iPad, Google's ( GOOG) Nexus and Amazon's ( AMZN) Kindle Fire, to overtake notebook shipments for the first time in North America, according to the latest figures from NPD DisplaySearch.

The research firm estimates that 21.5 million tablets will be shipped in North America during the fourth quarter, compared to 14.6 million notebooks and mini-notebooks. In 2013, tablet shipments in North America are forecast to exceed notebooks on an annual basis for the first time, with 80 million tablets versus 63.8 million notebooks, NPD said.

Globally, however, tablets aren't expected to out-ship notebooks until 2015, when 275.9 million tablets are forecast to ship, compared to 270 million notebooks.

In a blog post, NPD DisplaySearch senior analyst Richard Shim cited a number of factors for the booming popularity of tablets. These include the already high penetration of PCs within U.S. households (more than 70%), which makes new PC purchases less necessary. The analyst also pointed to shifting consumer preference towards tablets in the U.S., and increasing efforts in the space from the likes of Amazon and Google.

"Black Friday and the ensuing holiday shopping season is expected to enhance an already prime opportunity for U.S. tablet adoption," wrote Shim, pointing to price cuts to already-declining Average Selling Prices (ASPs) on tablets. "The $199 price point has increasingly become the target to match or beat with the introductions of Google's $199 Nexus 7 and Amazon's Kindle Fire 7."

Shim also cites the increasing number of tablet form factors available to consumers, such as Apple's 7.9-inch iPad Mini, Samsung's 10.1-inch Galaxy Note and Microsoft's ( MSFT) 10.6-inch Surface tablet.

Apple has traditionally dominated the tablet market, although tech research firm IDC recently noted some market share slippage in the third quarter. With an uncertain macroeconomic environment and consumers delaying their purchases ahead of the iPad Mini launch, Apple's share slipped from 65.5% in the second quarter to 50.4% in the third quarter, IDC said.